On Mon, 2009-06-01 at 16:45 -0700, Robin H. Johnson wrote:
> - Finish new hooks for git: 
>   upload-pack.c - get_common_commits:
>   right before the 'return 0', check for and launch a new hook,
> passing
>   the have/want headers via stdin, and use the return code (AND the
>   stderr) to see if we should halt.

Could you expand on this? Doesn't sound too complex - if I understand
this,  'have' is the set of heads of branches that the server has and
'want' is the set of branches that the client figures it needs to update
(simplifying a little from [1]).

That said, when do we want to terminate the upload?

Best,
Arun

[1] http://git-scm.com/gitserver.txt